HANDHELD ELECTRONIC DEVICE AND CORRESPONDING NOISE-CANCELING HEADPHONES

摘要

A handheld electronic device including a connection interface, a voltage supply unit and a baseband circuit is provided. When headphones are connected to the handheld electronic device, the baseband circuit can determine the type of the headphones by controlling the operation of the voltage supply unit. Furthermore, when the headphones are noise-canceling headphones, the baseband circuit can control the operation of the voltage supply unit to provide operation power to the noise-canceling headphones. In addition, corresponding noise-canceling headphones including a connection interface, at least one switch circuit, a switch control unit, a communication microphone, two speakers, a noise-canceling circuit and two noise-canceling microphones is also provided.

主权项

1. A handheld electronic device, comprising:
a connection interface, comprising a first pin, a second pin and a third pin, wherein the first pin is configured to transmit a first speaker signal and the second pin is configured to transmit a second speaker signal; a first impedance unit, electrically connected between the second pin and a power supply voltage; a second impedance unit, electrically connected between the second pin and a reference voltage; a voltage supply unit, electrically connected to the third pin; and a baseband circuit, electrically connected to the second pin, the third pin and the voltage supply unit, wherein the baseband circuit is configured to determine whether there is a headphone being electrically connected to the connection interface according to a voltage change at the second pin, wherein when there is a headphone being electrically connected to the connection interface, the baseband circuit is further configured to control the voltage supply unit to provide a first voltage to the third pin and then determine a type of the headphone according to a voltage at the third pin, wherein when the headphone is determined as a noise-canceling headphone and the handheld electronic device decides to activate a noise-canceling function of the noise-canceling headphone, correspondingly the baseband circuit is configured to control the voltage supply unit to provide a second voltage to the third pin, wherein the second voltage is functioned as an operation power of a noise-canceling circuit, for providing the noise-canceling function, of the noise-canceling headphone.